用于混合动力汽车的软开关双向DC/DC变换器

A soft-switching bi-directional DC/DC converter for hybrid electric vehicles

双向DC/DC变换器作为混合动力汽车能量管理系统的核心,在混合动力汽车能量双向转换控制中起到关键作用。根据混合动力汽车对双向DC/DC变换器的要求,选取双向Buck/Boost变换器作为主电路拓扑,减小了重量与体积、提高了系统的工作效率,同时采用半导体软开关技术有效减小开关损耗。推导出变换器在不同工作模式时的动态模型,并对相应模式下的控制器进行设计,提高了系统的稳定性和动态响应速度。最后,仿真和实验结果验证了理论分析的正确性。

Bi-directional DC/DC converter is the core of the hybrid electric vehicle＇s energy management system and plays a key role in its energy hi-directional flow control. According to the requirement of the hybrid electric vehicle to its converter, we select the bi-directional Buck/Boost converter as the main circuit topology, which reduces the weight and volume and improves the work efficiency. At the same time, we use semiconductor soft switch technology to reduce the switching loss effectively. Dynamic models of this bi-directional DC/DC converter under different operation modes are derived, controllers corresponding to different working modes are also designed, and thus both system stability and dynamic response ability are improved. The simulation and experimental results validate the correctness of theoretical analysis.